After keynote, Julian Castro's political future still unwritten

Lisa Krantz/San Antonio Express-News

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Mayor Julian Castro stands with the Texas delegates for the Credentials Committee, which he is the co-chair of, as they prepare for a group photo after a meeting of the committee at the Charlotte Convention Center in Charlotte, NC, for the Democratic National Convention on Sunday, Sept. 2, 2012.

Mayor Julian Castro stands with the Texas delegates for the Credentials Committee, which he is the co-chair of, as they prepare for a group photo after a meeting of the committee at the Charlotte Convention Center in Charlotte, NC, for the Democratic National Convention on Sunday, Sept. 2, 2012.